Martin Medlar (4 December 1899 – 4 June 1965) was an Irish Fianna Fáil politician who served as a Teachta Dála (TD) for the Carlow–Kilkenny constituency from 1956 to 1965. A farmer by profession, he was elected to Dáil Éireann as a Fianna Fáil TD for the Carlow–Kilkenny constituency at the 1956 by-election caused by the death of Thomas Walsh of Fianna Fáil. He was re-elected at the 1957 and 1961 general elections. He lost his seat at the 1965 general election.